Ideal for African Cichlids, livebearers, and any marine aquarium. Pure aragonite, ground to 10 microns for maximum surface area, provides flash mineralization of purified water. This non-caustic powder supplies calcium and carbonate, as well as a full suite of natural trace elements, all without any ionic residual or by‑product of any kind. How? Aragonite is what your corals are made of, nothing more and nothing less.